The other kitties in the household are not as charmed by Snafu as we humans. He can be very aggressive if the mood strikes him. While Wizard tolerates him and mostly leaves the room where he is acting up, Yukon will whap him if he gets too close, and Penny will offensively attack him if he's "in a mood." Owen has learned to take him in short spurts, running for a high place when he's had enough or if Snafu bites too hard (usually in the privates). He is very aggressive towards BJ and Angus and will stalk and attack them if given a chance.
Three Feliway dispensers keep the worst of him in check and our watchful eyes follow him around to monitor his whereabouts. But in order for everyone to track him more easily he has been given something very special...
We've tried a calming collar on him for a couple of months (new and fresh each month), but he just chews that up and spits it out laughing (not really). He gives new meaning to the phrase "Hells Bells."